Allert Jansz, an Anabaptist martyr, was seized on 13 April 1570 at Haarlem in the Dutch province of North Holland, and at the same place burned to death on 6 May 1570 after many attempts to make him recant.

Braght, Thieleman J. van. The Bloody Theatre or Martyrs' Mirror of the Defenseless Christians Who Baptized Only upon Confession of Faith and Who Suffered and Died for the Testimony of Jesus Their Saviour . . . to the Year A.D. 1660. Scottdale, PA: Herald Press, 1951: 845. Available online at: http://www.homecomers.org/mirror/index.htm.